Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
And so, the more suitable word for the curb bit should be the lever bit, for obvious reasons. The word lever: Noun lever: 1. a simple machine that gives a mechanical advantage when given a fulcrum. Verb lever: 1. to move or force, especially in an effort to get something open (like using a can opener).